期刊
CATALYSTS
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/catal12050571
关键词
electrocatalysis; oxygen reduction reaction; sulfur dioxide; durability
资金
- National Key Research and Development Program of China [2016YFB0101207]
- Natural Science Research Project of Jiangsu Higher Education Institutions [20KJA530004, 21KJA530004]
- Excellent scientific research and innovation team project of Yancheng Teachers University
- Outstanding Youth Project of Guangdong Provincial Natural Science Foundation [2022B1515020020]
A Pt/C-TiO2 catalyst has been developed against SO2 poisoning during ORR, showing superior performance in ORR and anti-toxicity. The accelerated removal of poisonous SO2 on Pt surfaces is achieved through the interaction between Pt and TiO2 as well as the abundant hydroxyl groups on the surface of TiO2.
Proton exchange membrane (PEM) fuel cells using Pt-based materials as electrocatalysts have achieved a decent performance, represented by the launched Toyota Mirai vehicle. The ideal PEM fuel cells consume stored pure hydrogen and air. However, SO2, as a primary air contaminant, may be fed along with air at the cathode, leading to Pt site deactivation. Therefore, it is important to improve the SO2 tolerance of catalysts for the stability of the oxygen reduction reaction (ORR). In this work, we develop the Pt/C-TiO2 catalyst against SO2 poisoning during ORR. Impressively, the hybrid Pt/C-TiO2 catalyst with 20 mass % TiO2 shows the best ORR and anti-toxic performance: the kinetic current density of ORR is 20.5% higher and the degradation rate after poisoning is 50% lower than Pt/C. The interaction between Pt and TiO2 as well as the abundant hydroxyl groups on the surface of TiO2 are both revealed to account for the accelerated removal of poisonous SO2 on Pt surfaces.
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